Other
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...68..503s&link_type=abstract
Icarus (ISSN 0019-1035), vol. 68, Dec. 1986, p. 503-521.
Other
36
Astronomical Photometry, Io, Satellite Surfaces, Backscattering, Color, Limb Darkening, Polar Regions, Porosity, Surface Roughness
Scientific paper
Disk-resolved near-opposition phase curves, derived for regions on Io suggest differences in surface texture among materials of different color on the satellite. This suggestion is tested quantitatively, using a photometric function having physically meaningful parameters. Derived values of the Hapke compaction parameter suggest that (1) a large percentage of the material on Io's surface has a porosity significantly greater than 60 percent and (2) average and polar materials are significantly more porous than Bright material, a contrast consistent with the Matson and Nash (1983) SO2 cold trap model. For the color classes, and for Io as a whole, the degree of backscattering tends to increase toward longer wavelengths. The average macroscopic roughness of the Ionian surface, characterized by a mean slope angle of about 25 degrees, is similar to that of other solid surfaces in the solar system.
Simonelli Damon P.
Veverka Joseph
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